Cotton denim shirt, £95, Damson Madder; Cotton straight leg jean, £255, E.L.V Denim at Fenwick; Upcycled trainers, £176, Aspect Climate ProjectsNow for the gentle reminder of quite how damaging denim is to the environment. A single pair of jeans can use as much as 10,000 litres of water in its production process. Where possible, look for repurposed denim.